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logic for checking mode for 'fopen' moved to macro 'lua_checkmode'

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Roberto Ierusalimschy 2013-03-21 10:57:27 -03:00
parent af8efcc762
commit c8e96d6e91
1 changed files with 11 additions and 10 deletions
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21
liolib.c
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@ -1,5 +1,5 @@
/*
** $Id: liolib.c,v 2.109 2013/03/16 21:10:18 roberto Exp roberto $
** $Id: liolib.c,v 2.110 2013/03/20 19:40:07 roberto Exp roberto $
** Standard I/O (and system) library
** See Copyright Notice in lua.h
*/
@ -32,9 +32,15 @@
#if !defined(lua_checkmode)
/*
** this macro can accept other 'modes' for 'fopen' besides the standard ones
** Check whether 'mode' matches '[rwa]%+?b?'.
** Change this macro to accept other modes for 'fopen' besides
** the standard ones.
*/
#define lua_checkmode(mode) 0
#define lua_checkmode(mode) \
(*mode != '\0' && strchr("rwa", *(mode++)) != NULL && \
(*mode != '+' || ++mode) && /* skip if char is '+' */ \
(*mode != 'b' || ++mode) && /* skip if char is 'b' */ \
(*mode == '\0'))
#endif
@ -220,13 +226,8 @@ static int io_open (lua_State *L) {
const char *filename = luaL_checkstring(L, 1);
const char *mode = luaL_optstring(L, 2, "r");
LStream *p = newfile(L);
int i = 0;
/* check whether 'mode' matches '[rwa]%+?b?' */
if (!(mode[i] != '\0' && strchr("rwa", mode[i++]) != NULL &&
(mode[i] != '+' || ++i) && /* skip if char is '+' */
(mode[i] != 'b' || ++i) && /* skip if char is 'b' */
(mode[i] == '\0')) && !lua_checkmode(mode))
return luaL_argerror(L, 2, "invalid mode");
const char *md = mode; /* to traverse/check mode */
luaL_argcheck(L, lua_checkmode(md), 2, "invalid mode");
p->f = fopen(filename, mode);
return (p->f == NULL) ? luaL_fileresult(L, 0, filename) : 1;
}